1900-1901.] Prof. Letts and Mr Hawthorne on TJlva latissima. 27 5 
Analysis of Barium Salt dried at 100° C. until of constant iv eight. 
(1) 0*5153 grm. gave 0*4190 grm. BaS0 4 = 0*2464 grm. Ba 
= 47*8% Ba. 
[The salt had been washed several times with cold alcohol.] 
(2) 0*2000 grm. gave 0*1623 grm. BaS0 4 = 0*09543 grm. Ba 
= 47*71%. 
[The salt, after washing with cold alcohol, had been boiled 
with alcohol.] 
(3) 0*2648 grm. gave 0*2156 grm. BaS0 4 = 0*1268 grm. Ba 
= 47*87% Ba. 
[In addition to the treatment to which (2) had been submitted, 
this portion of the salt had been recrystallised from water by the 
addition of alcohol.] 
(4) 0*3216 grm. gave 0*2622 grm. BaS0 4 = 0*1542 grm. Ba 
= 47*93% Ba. 
[This salt was obtained from the mother liquors of (3), but was 
recrystallised from water and alcohol.] 
Obtained : — 
Calculated for : 
;• — 
(i) • 
47*8 
Ba(C 2 H 3 0 2 ) 2 
53*72 
(2) • 
47*71 
Ba(C 3 H 5 0 2 ) 2 . 
48*41 
(3) . 
(4) • 
47*87 
47*93 
Ba(C 4 H 7 0 2 ) 2 . 
44*05 
In order still further to identify the propionic acid, a quantity 
of the silver salt was obtained by decomposing a solution of 2 
grams of the barium salt with the equivalent quantity of silver 
nitrate. The resulting white precipitate was washed on a filter 
until the washings gave no precipitate with sulphuric acid, and 
crystallised from hot water. 
Analysis of Silver Salt dried in the desiccator. 
(1) 0*232 grm. gave on ignition 0*1305 grm. Ag = 56*25%. 
(2) 0*0720 grm. „ „ 0*0400 „ =55*55% 
[obtained from the mother liquors of No. 1]. 
(3) 0*3633 grm. gave on ignition 0*2141 grm. Ag = 58*98% 
[obtained by further evaporation of the mother liquors from 
No. 2]. 
% Ag obtained : — 
(1) . 56*25 
(2) . 55*55 
(3) . 58*93 
% Ag calculated for : — 
AgC 2 H 3 0 2 . 64*66 
AgC 3 H 5 0 2 . 59*66 
AgC 4 H 7 0 2 . 55*38 
